char* replaceSpace(char* s)
{

    int len = strlen(s);
    char ss[8000];

    for (int i = 0, j = 0; i < len; i++, j++)
    {
        if (s[i] != ' ')
        {
            ss[j] = s[i];
        }
        else
        {
            ss[j++] = '%';
            ss[j++] = '2';
            ss[j] = '0';
        }
    }
    s = ss;
    return s;
    // write code here
}